Hi,
1.4.2 is not even the latest minor release of 1.4.x branch, there was 1.4.3 & 1.4.4 after that!
And the 1.7 version is going to be release very soon.
Is there a particular reason not to upgrade ?
I mean tons of bugs have been fixed since 1.4.2...
Well it's just weird that the jquery website itself doesn't use the available version mentionned on home page. Don't you think the same way?
jQuery is highly tested and that's also one of the reasons each release is solid, see :
Maybe the best advertising is to use it at first :D
Cheers from France++